Jerry gives pretty reliable information and without the ego. Trust it.
There's several people on this forum that had problems after lowering their bike.....too much. I was riding directly behind Jonga on a CVO gtg (get together) when he leaned just a bit to far to the left. His floor board didn't have a chance to fold up....didn't even touch his floorboard.....it hit on the floorboard mount. Rear tire came off the ground and he slid into the hillside on that curve. I posted pics of that accident and the bike somewhere on this forum.
If you're riding a Street Glide, as Jerry pointed out, they're already lowered. I'd suggest just leaving it.....especially if you like to really get into the twisties.
On another note.....the ride quality. I had a 2010 CVO Street Glide. I've had back issues for many years and it got progressively worse in the two years that I had the SESG. I sold that bike thinking I wasn't going to be able to ride anymore. That was a little over two years ago.
My road dog, Andy, was pretty sure that it was due to the stiffer suspension, shorter shock travel and the hard ride of the low profile tires. Eventually, he talked me in to bringing one of his Ultra Classics down here to San Diego. He'd call me every week and ask if I'd rode it yet. No, no, no-not yet. Then I finally took it out for a couple of hours and no back problems. Took it the following weekend and again no problems. Started taking it longer and longer until I was taking it all day long and still no problem. This past xmas I bought a 13 CVO Ultra Classic and rode it home from Charlotte, NC to Coronado, Ca (San Diego), 2,500 miles in 2 1/2 days with no back problems. Next week I will ride from Coronado to Ouray, Colorado in a day and a half and I don't expect any back issues.
Just sayin.....I loved my SESG and I was in denial that a 1" shorter shock could really make that much of a difference. It always felt good sitting in the Corbin seat and the back pain would come on gradually, not as soon as I got on the bike. So I was just so damn sure that it wasn't the bike. I still have back problems.....a lot. But not on this SEUC and it has a stock seat. First bike I've ever owned and still have a stock seat months later.

Huge difference in the ride comfort of a SESG to a SEUC.
